How to run 2 pumps off one hydraulic tank?

[chad22]

Hi. I was thinking about redoing my backhoe and not have it mounted on the riding mower. An Idea I was thinking of was to make my backhoe similar to this one on ebay. 2007 GO FOR DIGGER TOWABLE BACKHOE | eBay

The wheels are drive able with hydraulic motors and that's the way I want my backhoe.

What I'm thinking of doing is taking the valve I got now and use it for the driving and hydraulic outriggers. Then buy some joystick loader valves for the boom, bucket, and stick, swing operation.

The idea I had to run the 2 pumps for the different valves was to tee off the suction port of the tank. But would that work? And is it okay to use steel water fittings on the tank part before the pump?

But then I got to thinking why not use one pump and just put a valve on the pressure side between the control valves. This way I could close flow to the boom, stick, bucket etc valve and divert the flow to the outrigger and driving control valves.

So my basic idea is. When I'm ready to drive the backhoe, all I do is close the valve and then reopen it when I go to digging mode.


I hope this made sense. :laughing:

Chad

 

[J_J]

You could probably do that but why not use a selector valve for the two circuits. With no voltage applied, one of the systems operate, and when you switch the valve on, the other system operates. Similar to the valves for the curl and grapple circuits. Either install a relief after the pump, or insure the valves have reliefs in them.

https://www.surpluscenter.com/item.asp?item=9-7852&catname=hydraulic

https://www.surpluscenter.com/Instruct/I9-7852.pdf

 

[SSdoxie]

Running 2 separate pumps would require 2 drive connections off your engine.
You could either use a tandem pump (2 gear pumps in 1 assembly). Or use single gear pump then use a Power Beyond sleeve coming of the outlet of 1st valve feeding oil to the second. Either of these options would allow simultaneous use of backhoe and ground drive in case you get stuck or help in repositioning.

Do not use steel water pipe fittings, these are NPT connections not strong enough for high pressure hydraulics. Any hydraulics shop & most NAP stores can supply any steel hydraulic fittings needed.